Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d2a45c25898b4a5…

MALICIOUS

PDF

82.7 KB Created: 2021-08-18 17:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4b84601790144a6b75f4e77636869b35 SHA-1: f436ac1549ba22c83c9c73ddf7d1bc1fa046670b SHA-256: 9d2a45c25898b4a5db469fdd222b178981e14f09eb85168b8a7429cb00a6c99c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an attempt to lead users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4f8a60dc8---wimapofenefusoxepolazeg.pdf In PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/11588465516.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/gewutegabosozeki.pdfIn PDF document text
    • http://shesob.com/file/files/12643559879.pdfIn PDF document text
    • http://moon-villa123.com/CKEdit/upload/files/repipolezalizax.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/76743456068.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/vefowopumudolowabed.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/14018823064.pdfIn PDF document text
    • http://signauction.net/userfiles/file/38481805481.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835a7ec0b69---26196438232.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160ac721500882---30298593104.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a94d24b4a---lexusonudixiv.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/79901249093.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/88237021016.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/rujawuguvibemizizenudut.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d157d99798---2715936082.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/renogagomuditebefuzeru.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8b8adeda1---84707831264.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1d64266a4---vowuredaboxapopibati.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/217210ef74fee407f19180ddbc0a71e5/potopitedijapigolu.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cabe77df3c---45014680874.pdfIn PDF document text
    • http://rilta.net/userfiles/files/vasogefolek.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/zebis.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086346de3cba---bilozaluwidedozeledewedu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+long+does+it+take+to+beat+crash+bandicoot+n+sane+trilogyPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB7 16512 bytes
SHA-256: 4875f71721990b0766fa8312254e1084ee5448f58a37ff32270d4be6358c7b2f
font_01_sfnt_off000108a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BC 11072 bytes
SHA-256: db826194aaf3e5ab34555df72d7ad1acce626bb29e9e29d86ecb18f9a2122a92

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